Warp stop mechanism for looms



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WARP STOP MECHANISM FOR LOOMS.

AP'PLICATIION man MAR 16, 1922.

2 SHEETSSHEET '1,

1,438,564. Patented Dec.12,1922.

U I f um I h m a/c, W

I. smow. WARP STOP MECHANISM FOR LOOMS.

APPLICATION FILED MAR. 16, I922- -2 SHEETS-SHEET 2- Patented Dec. 12,1922?.

Patented Dec. 12, llQZZ.

ISAAC SHOW, 05 LIUNRENCE, IEASSAGTHUSETTS. ASSIGNOR TO DBAPEECORPORATION, OF HOZPEDALE, I'DIASSAGHUSETTS, A CORPORATION OF HIAINE.

"WARP STOP MECHANISM FOR LOOMIS.

Application filed. March 16, 1922. Serial No. 5%,072.

To all whom it may concern:

Be it known that I, Ismxo Snow, a citizen of the United States, residingat Lawrence,

breaks or becomes too slack for wearing purposes. It will happen attimes during weaving that a warp thread will become crossed over otherwarp threads and produce defective clothunless the condition isremedied. Such crossing of a warp thread may occur when a warp threadbreaks be tween the shedding mechanism and the fell of the cloth. Insuch case the broken end of the warp threac is liable to extend lat--orally of the loom and cross several of the warp threads of one of theshed planes, and when the shed is changed by the shedding mechanism, thecrossed end of the broken warp thread will deflect the warp threads ofthe other plane of the shed. and cause increased tension to be exertedon the warp threads of that plane. Should the weaving operation continueunder such condition defective cloth will be produced and therefore oneof the purposes of the present invention consists of means for effectingloom stoppage when a drop wire of the warp stop mechanism is abnormallyraised by a warp thread.

It is also desirable to stop the loom when one of the warp threadsbreaks or becomes too slack for weaving purposes, and another importantfeature of the present invention therefore consists of a warp stopmechanism in which two feelers are employed, one of which is adapted tobe arrested and effect loom stoppage when a drop wire is abnormallyraised and the other of which is adapted to be arrested and effect loomstoppage when a drop wire is abnormally lowered as by breakage or undueslackage of a warp thread. i i

The accompanying drawings illustrate one good form of the inventionwherein one of the feelers is constructed and arranged to be arrested inits detecting movement above the plane of the warp threads and the otherof which is adapted to be arrested in its detecting movement below theplane of the warp threads; and while this consti-v tutes a good form oftheinvention the essential advantages thereof may be secured by otherarrangements of the feelers and drop wires. In the drawings, Fig. 1 is aperspective view, showing sufficient portions of a loom to make clearthe association of the present ;invention therewith.

Fig. 2 is anenlarged cross sectional view of the warp stop mechanismproper.

Fig. 3 is a detached. enlarged detail showing one means for giving thetwo feelers their detecting movements.

Fig. 4 is a modified form of means for giving the two feelers theirfeeling movements.

It is the object'of warp stop motions, as now generally constructed, tostop the loom whenever a warp thread breaks. This functional operationof thewarp stop motion is dependent on the release of some kind of adetector or drop device by the broken warp thread which becomes tooslack to support the drop device or detector. It sometimes happens,however, that the end of the broken thread gets crossed laterally of theadjacent intact warp threads and is held taut or does not slackensufiiciently to free the drop device or detector, and in such case theseprior warp stop motions fail to function even though a warp threadbreaks.

The warp stop mechanism of the present invention includes a series ofdrop wires which are normally supported by the warp threads duringweaving and which are free to move into an abnormal position either bybreakage or by undue slackness of a warp thread or into another abnormalposition by undue tension of the warp thread, the two feelers areconstructed and arranged, one to eifect loom stoppage when a drop wiremoves into one abnormal position upon breakage or undue slackage of awarp thread and the other feeler of which 1s ar-- rested whena drop wireismovedinto the other abnormal position by undue tension exerted on awarp thread.

The warp threads at are wound upon thethe warp stop motion proper,either with or without being positioned by the lease k mechanism bywhich the warp threads are divided into appropriate sheds from time totime then through the reed of the-lay and frontwardly to the fell of thecloth or weaving line and thence tothe usual sand. roller or take up.

rodsfthen through the shedding;

The loom frameis of usual character appropriatefor supporting theloonrparts and has a breast beam 4 to which. is secured the temple 5which engages'the cloth Z) at the point rearward of the usual sand ortake up roll 6. The lay 7 has the usual reed 3 through which the warpthreads pass as usual, and the lay is given its usual beat up movementsby a well known train of mechanism. i I

The shedding mechanism for-producing a shed for the introduction of theweft or filling thread may be of any usual and well known type and asindicated in Fig. 1 comprises theharness forms 9 and 10 between theupper and lower bars of which arethe heddles 11 each having "an eye forthe pas sage of a warp thread as usual. The mechanism for forming; theshed not'show'n be cause the details thereof formn'o part of the presentinvention and may be of the usual and well known character.

The warp'stop motion proper as shown in I Fig.1 is positioned betweenthe" shedding mechanism and the whip roll and is supported on suitablebrackets 12 extending from ca ch .side of the loom fra me. To facilitateadjustment of the warp stop mechanism' proper into its desired positionthe brackets 12 maybe providedwith slots'13 engaged by bolts, 14 passedthrough the slots 15 of side brackets 16 oneat'ea'ch side of the loom.

' Since each'of theside brackets 16 may be of the same construction itwill not be necessary to describe more than one.

drop wires20, two rows of such drop wires being shown in the presentinstance. Each drop. wire 20 is normally supported by a warp thread a,during weaving and in the present instance each drop wire has an openingor eye 21 through which the warp thread may bepassed. The drop'wires areguided" in their movements and as shown each drop wire in thepresentinstance has an elongated slot 22 through which extends one ofthe drop .wire guides 23; the construction being such that the dropwires 20 which are arranged in rowsinay be guided in their up and downmovements for the action of the feelers, presently "to be described. Thethread guides 23 are secured at each side of the loom to the sidemembers 1'? as indicated in Fig. l. H

In accordance with the present invention the loom is to be stopped whenone of the drop wires drops or is free'dfrom its warp support by hebreakage or unducslackness of a warp thread andalso when one of the dropwires is moved into another abnormal position by unduete sion on a warpthread. This feature of the invention is carried into effect by twofeelers one of which is arrested by an abnormally raised drop wire andthe other of which is arrested by an abnormally lowered drop wire.

In the present instance the warp rest members 18 are each provided withthe tooth plates 24% and mounted for detecting movement towards andfromthe plates 24: is the feeler 25. 'Thc feeler 25 is shown as hav ing atoothed edge portion 26 at each side adapted to engage and be arrestedby one of the drop wires when it fails to be supported by a warp thread;The feeler 25 is secured to rocker arms 27 of which there may be asuitable number to properly support the feeler between the sides of theloom. The

feeler rocking arms 27 are mounteduponthe rocker ment, as usual in warpstop motionsy from some going part ofthe 1007111. In the pres entinstance the rocker 28 has the lugs 29,

Fig. 2, which are connected by links 30 to a train of mechanism forimparting to the rocker 28 andperforce the feeler 25 the feeler ordetecting movement; The train of mechanism to which reference has beenmade may be-of the general type of that shown 28 which receives'arockingmoyethrough which the 'leeler extends.

ine; the extension3h with the lower and describedin the patent to George-linbleti'. No. 863,830, August 13:5. 1907, but any well known trains ofmechanism for giving the iceler its detecting movement may be employed.In tl e present instance of the invention the stopping mechanismcomprises means for arresting the loom operation'when one o1"? thefeelers is arrested. Such stopping mechanism is typified in Fig. l bythe shipper 31 which may be thrown from holding notch 332 to effect loomstoppage substantially indicated in the An bler patent hereinbeitorementioned.

The rocker arm 27' at the side of the loom is shown as outside of thebracket or dowin ward extension 3?) of side member .ll' by which theroclrer is Supported, and. in such case the portion is provided withaslot 34: The slot is of appropriate size and character to permit theteeler to partake of its detecting movements. 1

Extending transversely ot the loom, and as shown in the presentinstance, between the warp rest men'ibers 18 is a rod or shaft on whichmounted for rockingmovement the other te'eler member which acts toeffect loom stoppage when one. of the drop wires is abnormally raised bya warp thread unduly tensioned. In the form of the invention indicatedin Figs. 1 and 2 the rod or shaft extends outside of side members 17 andlldSdl'lOllTllltXl thereon the tteeler 36, the

upper portion 37 of which extends transversely ot the loom adjacent tothe upper end portions of the drop wires. The side members of the teeler36 or at least one of them has adownward extension 38 which passesthrough an opening 39 in the bracket 16 and at its lowerend connectedwith the other feeler.

In the present instance the feelerfifiis connected to the feeler 25through the extension 38. Fig. 3, the lower end portion of which isloosely connected to thelugs 39 carriedv by the train of: mechanismconstituting the lower teeler. The lugs or bearings 39 have an enlargedopening 4C0 through which. passes the pin ll. l inl 1;:

From the construction thus tar dos it will be apparent that thedetecting movement given to the lower teeler 25 will impart detectingmovements to the other or upper teeler and that such movements of thetwo feelers will be in opposite directions. In other words. when feel-er25 moves to the lctt. 2. iieeler 36 willmove to the right. and it eitherfeeler be arrestedby a drop wire it will act through the trainoi stopmechanism to effect loom stoppage.

Fig. i shows a modified form of the connections between the two feelerswhereby both feelers will move simultaneously inthe same directionrathjerl than, in the opposite direction. as effected by thehereinbetore de scribed connections between the two feelers. In Fig. Lthe rocker '28 which is the same as the rocker of Fig. 2 carries theteeler ZLKIDS 42 of which there may be any desired numher. to which issecured the lower .teeler 43. The rocker 28 is given its rockingmovement by the train of mechanism such as is shown tor instance in thepatent to Ambler hereinbetore mentioned. In Fig. i the rocker 28 has anarm 44; connected by a link t5 with an arm 46 extendingtrom the hubportion of the upper ieeler supporting arm a? carrythe rod or teeler4:8. The arms 46 and 4%? are mounted on the rod or shaft 49. Fig. t, theconstruction being such/that upon rocking movement of the rocker28 thelower teeler will be given its detecting movement and the upper :teelerwill be given a like detecting movement in thesame direction.

Should a warp thread become crossed, that is be crossed over two or morewarp threads forming the shed, it will bind together the adjoiningthreads ot the other shed plans when the shed is chan ed andconsequently put increased tension on the threads of such other planeThis is indicated in Fig. I wherein the warpthreadc of the lower shed.is shown as having been broken between the shedding mechanism and thereed of the layand such end a. is indivcated. as crossing several of thewarp threadspso that as the threads which iorno the upper plane theshedare; raised by "the sheddingmechanisin the warp threads are given anincreased tension: or lengthwise pull due to the deflection of suchthreadsby the crossed warpend. The effect of this is that the. warpthreacs that have been crossed by the broken end-lift or raise the dropwires through which they pass. As indicated in Fig. 1 there are usuallyseveral warp threads given increased tension under the conditions notedand so several. of the drop wires are raised. It inay sometimes happenthat the warp threads that form the diii'erent shed planes may be stucktogether or intertwined by a stray piece of thread or by a bunch offlutl or fibre in which' case the increased tension will be placed uponthe warp threads thus bound together and the associated drop wires willbe raised when the shed is formed.

Usually it will be sufficient to depend upon the shedding mechanism tolift the drop wires an abnormal amount or into stopping position whenthe shed is formed but in some cases it may be desirable to lace thewarp stop motion proper, slightly below the horizontal plane passingthrough one to be arrested by a drop wire when it is moved into anabnormal position by the breakage or undue slackness of a warp threadand the otherof which is moved into another abnormal position by unduetension placed upon the warp threads, the effect being that imperfectcloth which may result from either broken or too slack threads or from acrossed warp thread will be prevented because the loom will be stoppedonthe occurrence of either defect in the threads and enable the weaver orattendant to cor rect the fault.

What is claimed 'is: I I

1. In a warp stop mechanism forlooms, the combination of a series ofdrop-wires normally supported by the warp'threads during weavin loomstopping mechanism,

two feelers having detecting movements, one

above andthe other below the plane of, the warp threads,and connectionsbetween the feelers and stopping mechanism for, stopping the "loom whena drop wire is raised to an abnormal position by a warp thread or islowered to an abnormal posit-ion due to breakage or slackness of .awarp. thread.

2. In a Warp stop mechanism for looms,

the combination of a series of drop wires normally supported by the warpthreads during weaving, two feelers having detectmg movements, one ofwhich feelers is con structed and arranged to be'arrested when a dropwire is abnormally raised by a war p,

thread and the other of which is constructed and arranged to be arrestedby. a drop wire when a warp thread breaks or becomes too slack, andstopping mechanism for stop;

ping the loom when the detecting movement of either of the feelers isarrested.

' 3. In a warp stop mechanism for looms, thercoinbination of a series ofdrop'wires adaptedto be supported by the warp threads during weaving,drop wire guides for the series of drop wires, two feelers havingdetecting movements, one of said feelers adapted to engage and'bearrested by a drop wire when it is raised to an abnormal position, andthe other to engage'and be arrested by a drop wire/when it lS'lOWQIGClto an abnormal position, and, stoppingmechamsm. for stopping the loomwhen either of the feelers is arrested. I

4. In a warp stop mechanism for looms,

the combination of shedding mechanism, a

series of drop wires adapted to bes'upported by the warp threads duringweaving, a feeler having a detecting movement above theplane of the warpthreads and adapted to bearrested by a drop wire when it is abnormallyraised by a warp thread, and loom stopping mechanism for stopping theloom when the feeler is arrested by an abnormally raised dropwire. j

'5. In awarp stop mechanism for looins, the combination of shedding"mechanism, a

series of drop wires adapted to be supnism for stopping the loom wheneither feeler is arrested by a drop wire.

6. In a Warp stop mechanism for looms, the combination of a series ofdrop wires adapted to be supported by the warp threads during Weaving,loom stopping mechanism, two feelers one of which has a detectlngmovement adjacent the upper portions of the drop wires and the other ofwhich has a detecting movement adjacent the lower portions of the thedrop wires, and means controlled by the two feelers to cause thestopping mechanism-to effect loom stop-- page when either of the feelersisarrested by a drop wire. j I

7. Ina warp stop mechanism for looms, the combination of. a series ofdrop wires adapted to be supported by the warp threads durin weaving,loom stopping mechanism,

two f eelers one of which has a detecting movement adjacent the upperportions of the drop wires and the other of which has a detectingmovement adjacent the lower portions of "the drop wires, connectionsbetween the feelers and means controlled by the twoufeelers to cause thestopping mechanism to effect loom stoppage when either ofthe feelers isarrested by a drop wire.

8. In a warp stop mechanism for looms,

-the combinationflof-a, series of. drop wires adapted to be supported bythe warp threads during weaving, loomshedding mechanism, two feelershaving detecting movements toward and from the drop wires, the detect--1ng movement of one ofthe feelers being arrested when a drop wire isabnormally raised and the detecting movementof the other feelerv beingarrested when a drop wire .is abnormally lowered, and loom stoppingmechanism for stopping the loom when the detecting movement of eitherfeeler is arrested. 1 I p 9. In a warp stop mechanism for looms, thecombination of a series of drop wires adapted to be supported by thewarp threads during weaving, loom shedding mechanism, a feeler having adetecting movement and adapted to be arrested by an abnormally raiseddropwire when the shed is opened, loom stopping mechanism forstoppingthe loom when'a drop wire is abnormally raised and anotherfeeler adapted to-be arrested and effect loom stoppage when a warpthread breaksor becomes too slack.

10,- In a warp stop mechanism for looms,-

the combination of a series of drop Wires adapted to be supported by theWarp threads during Weaving, drop Wire guides for the drop Wires, tWofeelers, one of Which is adapted to engage and be arrested by a dropwire above the plane of the Warp thread and the other of which isadapted to engage and be arrested by a drop wire below the plan: of theWarp threads, and loom stopping mechanism for stopping the loom wheneither of the feelers is arrested.

In testimony whereof, I have signed my name to this specification.

ISAAC SNOVW

